EP0470283B1 - Méthode et dispositif pour déterminer la qualité de circuits virtuels transitant par un dispositif de commutation ATM - Google Patents

Méthode et dispositif pour déterminer la qualité de circuits virtuels transitant par un dispositif de commutation ATM Download PDF

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Publication number
EP0470283B1
EP0470283B1 EP90115250A EP90115250A EP0470283B1 EP 0470283 B1 EP0470283 B1 EP 0470283B1 EP 90115250 A EP90115250 A EP 90115250A EP 90115250 A EP90115250 A EP 90115250A EP 0470283 B1 EP0470283 B1 EP 0470283B1
Authority
EP
European Patent Office
Prior art keywords
message cells
quality
atm switching
counting means
connection
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP90115250A
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German (de)
English (en)
Other versions
EP0470283A1 (fr
Inventor
Horst Dipl.-Phys. Schefts
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Priority to DE59010651T priority Critical patent/DE59010651D1/de
Priority to AT90115250T priority patent/ATE149070T1/de
Priority to EP90115250A priority patent/EP0470283B1/fr
Priority to JP22089891A priority patent/JP3207879B2/ja
Priority to CA002048459A priority patent/CA2048459C/fr
Priority to US07/741,731 priority patent/US5142653A/en
Publication of EP0470283A1 publication Critical patent/EP0470283A1/fr
Application granted granted Critical
Publication of EP0470283B1 publication Critical patent/EP0470283B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L49/00—Packet switching elements
    • H04L49/25—Routing or path finding in a switch fabric
    • H04L49/253—Routing or path finding in a switch fabric using establishment or release of connections between ports
    • H04L49/254—Centralised controller, i.e. arbitration or scheduling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/02—Details
    • H04L12/14—Charging, metering or billing arrangements for data wireline or wireless communications
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L49/00—Packet switching elements
    • H04L49/20—Support for services
    • H04L49/205—Quality of Service based
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L49/00—Packet switching elements
    • H04L49/30—Peripheral units, e.g. input or output ports
    • H04L49/3081—ATM peripheral units, e.g. policing, insertion or extraction
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing
    • H04Q11/0428—Integrated services digital network, i.e. systems for transmission of different types of digitised signals, e.g. speech, data, telecentral, television signals
    • H04Q11/0478—Provisions for broadband connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/54—Store-and-forward switching systems 
    • H04L12/56—Packet switching systems
    • H04L12/5601—Transfer mode dependent, e.g. ATM
    • H04L2012/5625—Operations, administration and maintenance [OAM]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/54—Store-and-forward switching systems 
    • H04L12/56—Packet switching systems
    • H04L12/5601—Transfer mode dependent, e.g. ATM
    • H04L2012/5629—Admission control
    • H04L2012/5631—Resource management and allocation
    • H04L2012/5636—Monitoring or policing, e.g. compliance with allocated rate, corrective actions
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/54—Store-and-forward switching systems 
    • H04L12/56—Packet switching systems
    • H04L12/5601—Transfer mode dependent, e.g. ATM
    • H04L2012/5638—Services, e.g. multimedia, GOS, QOS
    • H04L2012/5639—Tariffs or charging
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/54—Store-and-forward switching systems 
    • H04L12/56—Packet switching systems
    • H04L12/5601—Transfer mode dependent, e.g. ATM
    • H04L2012/5638—Services, e.g. multimedia, GOS, QOS
    • H04L2012/5646—Cell characteristics, e.g. loss, delay, jitter, sequence integrity
    • H04L2012/5647—Cell loss
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L49/00—Packet switching elements
    • H04L49/15—Interconnection of switching modules
    • H04L49/1515—Non-blocking multistage, e.g. Clos
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L49/00—Packet switching elements
    • H04L49/30—Peripheral units, e.g. input or output ports

Definitions

  • the invention relates to a method and a circuit arrangement for determining the quality of the virtual connections running over input lines and output lines of an ATM switching device, message cells being transmitted in the course of these virtual connections in accordance with an asynchronous transfer mode, and each of these message cells via a respective virtual connection for the cell head designating the input line or output line in question.
  • the problem with telecommunications switching systems is to monitor the quality of certain connections in order to e.g. to be able to provide appropriate information in the event of complaints.
  • EP-A-0 310 173 it is already known to monitor the compliance of predetermined transmission bit rates individually on the input side in a switching node operating according to the asynchronous transfer mode.
  • two upward counters are provided per subscriber, in order to both Connection duration as well as the number of cells transmitted during the connection duration.
  • a criterion for detecting an overload is derived from the ratio of the meter readings.
  • these two counters are used to record fees.
  • such an entry-side charge registration has the disadvantage that only the cells supplied to the switching node are taken into account. However, those cells that are lost due to a malfunction of the switching node, for example when hardware errors occur, and are therefore not properly forwarded to the receiving subscriber in question are not taken into account.
  • connection-specific monitoring for compliance with specified transmission bit rates perform. For this, the cells arriving for the respective connection are counted and the incoming cells are marked when a defined threshold value is exceeded.
  • this Switching system queues provided for defined service classes and sub-classes. The cells transmitted within the switching system are placed in these queues for forwarding in accordance with the service class required for the respective connection. Before the queues overflow, cells previously marked on the input side are destroyed, ie excluded from being placed in the respective queue.
  • the invention has the advantage that the quality of the individual virtual connections can be determined continuously on the basis of the transmitted message cells, without placing a dynamic burden on an ATM switching device for this determination.
  • the refinement according to claim 2 has the advantage of simple determination of the quality of an ATM switching device.
  • the advantage of the embodiment according to claim 3, however, is that only the amount of messages actually forwarded from an ATM switching device to a subscriber device is included in the fee calculation. As a result, for example due to transmission interference within an ATM switching device, repeatedly transmitted message cells or misdirected message cells are not taken into account when determining charges.
  • a circuit arrangement for carrying out the method according to the invention results from claim 4.
  • the advantage of this circuit arrangement is that the registration of the message cells transmitted in the course of virtual connections takes place in peripheral devices, so that the central control device of an ATM switching device largely by the Determining the quality of the virtual connections is relieved.
  • FIG. 1 schematically shows an ATM switching device VA to which a plurality of input lines E1 to En and a plurality of output lines A1 to An are connected. Of these, only the input lines E1 and En and the output lines A1 and An are specified in FIG.
  • Message cells are each transmitted on the input lines and output lines in the course of virtual connections using an asynchronous transfer method ("asynchronous transfer mode").
  • the message cells may be cells of fixed length, each of which has a cell header and an information part.
  • the actual message signals are transmitted in the information section.
  • Message signals are to be understood to mean data and text signals as well as voice or image signals in digital form.
  • a cell header however, contains u. a. a so-called virtual channel number, by which the respective virtual connection is designated on the input line or output line in question. In the rest of the transmission, corresponding empty cells are transmitted to the message cells.
  • each of the input lines and output lines is assigned an evaluation device AE, with all evaluation devices being connected to a central control device ST.
  • An evaluation device connected to an input line receives the message cells transmitted in the course of virtual connections and, when they are forwarded to a coupling arrangement KA of the ATM switching device, determines the number of connections in the connection Message cells transmitted during the respective virtual connection.
  • an evaluation device connected to an output line receives the message cells supplied to it in the course of virtual connections and, when forwarded to a subscriber device or to a subsequent ATM switching device, determines the number of message cells transmitted in the course of the respective virtual connection in a connection-specific manner.
  • the evaluation devices AE thus separately detect for each virtual connection running between an input line and an output line of the ATM switching device, the number of message cells received in the ATM switching device and those forwarded by the latter. After the respective virtual connection has been cleared down, the loss rate as a measure of the quality of the respective virtual connection is then determined by the central control device ST by forming the difference between the number of received and delivered message cells.
  • FIG. 1 shows, as an example only, a multi-stage structure with a plurality of coupling multiples KV connected to one another.
  • any one- or multi-stage coupling arrangements can also be used. Since the structure and mode of operation of such coupling arrangements for the forwarding of message cells to output lines designated A1 to An in FIG. 1 is known, it will not be discussed in more detail below.
  • FIG. 2 shows a possible construction of the evaluation devices specified in FIG. 1 using the evaluation device AE connected to the input line E1. Only those circuit parts are specified which are necessary for understanding the present invention.
  • An interface device S is connected to the input line E1 and continuously monitors the occurrence of message cells to be transmitted to the coupling arrangement KA.
  • the detection of a cell head leads to the output of a control signal which is fed to the central control device ST and a decoder DEC as an enable signal.
  • the respective cell header is fed to this decoder.
  • the decoder By decoding the virtual channel number contained in such a cell header, the decoder provides address signals which are fed to a counter arrangement Z via first inputs of a multiplexer M.
  • This counter arrangement has a separate counter for each of the virtual connections possible on the associated input line E1.
  • the individual counters can be individually controlled in accordance with the virtual channel numbers contained in message cells and decoded by the aforementioned decoder DEC. For example, if virtual connections labeled "0" to "m-1" can run through the relevant input line m, then, as indicated in FIG. 2, counters labeled Z0 to Zm-1 are assigned to them.
  • Address signals can also be fed to the counter arrangement Z from the central control device ST shown in FIG. 1 via second inputs of the multiplexer M mentioned, in order to individually control the individual counters.
  • the central control device is connected to the counter arrangement Z via bidirectional data lines.
  • the control device ST When establishing virtual connections, the control device ST provides the counters of the relevant input lines and output lines assigned to these virtual connections by providing corresponding address signals individually controlled. In this case, the central control device converts the respective counter into a fixed initial counter reading, which may be fixed with "0", for example, by means of signals transmitted via the data lines mentioned.
  • the cell heads associated with them are decoded by the decoder DEC.
  • the counters (Z0 to Zm-1) assigned to the virtual connections are controlled individually with the resulting address signals. With such a control, the current counter reading is changed by one counting unit, for example by the binary value "1". The resulting current current meter reading then remains stored until the respective meter is activated again. The individual activation of the individual counters repeats each time a message cell to be detected by the respective counter occurs until the respective virtual connection is cleared down.
  • the control processes explained using the example of the evaluation device AE connected to the input line E1 also take place in a corresponding manner in the other evaluation devices shown in FIG.
  • the counter connected to the input line in question detects the message cells received in the course of the virtual connection in question in the ATM switching device.
  • the counter connected to the output line in question detects the message cells forwarded by the ATM switching device in the course of the virtual connection in question.
  • the central control device ST assigns those connections Counter controlled by providing appropriate address signals.
  • the current meter readings stored in the two meters at this point are queried.
  • the loss rate as a measure of the quality of the virtual connection in question is then determined, for example, as already mentioned above, by forming a difference.
  • the loss rates of the individual virtual connections can then, as mentioned at the beginning, be used for maintenance purposes, information relating to the quality of the individual virtual connections and for the determination of charges.
  • an average loss rate can be formed as a measure of the quality for the entire ATM switching device from the loss rates of the virtual connections set up within a defined time interval by averaging.
  • each time a message cell or empty cell occurs two separate processing intervals are defined.
  • the second processing interval is available to the central control device ST for setting a counter when a connection is being established or for taking over a current counter reading when a connection is being cleared down.
  • the individual counters can be designed for a relatively low counting capacity if the current counter readings of these counters are queried by the central control device at fixed time intervals. For example, these time intervals could be in the minute range.
  • the counters can also be designed as periodically revolving counters, which supply the central control device with an alarm signal (overflow signal) each time a predetermined counter reading is reached. The number of for each Counters given over the course of time could then be added up individually in the central control device and taken into account when the virtual connections were cleared down when evaluating the current meter readings.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Claims (6)

  1. Procédé pour déterminer la qualité des communications virtuelles passant par l'intermédiaire de lignes d'arrivée (E1 à En) et de lignes de départ (A1 à An) d'un dispositif de commutation ATM (VA), des cellules d'informations étant transmises au cours de ces communications virtuelles selon un mode de transfert asynchrone et chacune de ces cellules d'informations disposant d'un en-tête désignant la communication virtuelle respective pour la ligne d'arrivée ou de départ considérée,
       caractérisé par le fait que
       dans le dispositif de commutation ATM (VA), on détecte séparément pour chaque communication, à l'aide des en-têtes des cellules d'informations reçues par l'intermédiaire des lignes d'arrivée (E1 à En) et fournies aux lignes de départ (A1 à An), le nombre des cellules d'informations reçues et le nombre des cellules d'informations envoyées et, à la suite de la suppression de la communication virtuelle considérée, on détermine, à partir des nombres détectés auparavant séparément des cellules d'informations reçues et envoyées, le taux de pertes des cellules d'informations comme mesure pour la qualité de la communication virtuelle considérée.
  2. Procédé selon la revendication 1,
       caractérisé par le fait que
       à partir des taux de pertes déterminés des communications virtuelles établies pendant un intervalle de temps fixé, on calcule un taux de pertes moyen comme mesure de qualité pour le dispositif de commutation ATM (VA).
  3. Procédé selon la revendication 1,
       caractérisé par le fait que
       on fait intervenir dans la taxation le taux de pertes déterminé pour la communication virtuelle considérée.
  4. Montage pour déterminer la qualité des communications virtuelles passant par l'intermédiaire de lignes d'arrivée (E1 à En) et de lignes de départ (A1 à An) d'un dispositif de commutation ATM (VA), des cellules d'informations étant transmises au cours de ces communications virtuelles selon un mode de transfert asynchrone et chacune de ces cellules d'informations disposant d'un en-tête désignant la communication virtuelle respective pour la ligne d'arrivée ou de départ considérée, en vue de la mise en oeuvre du procédé selon la revendication 1,
       caractérisé par le fait que
    aux lignes d'arrivée (E1 à En) et aux lignes de départ (A1 à An) est associé un nombre de compteurs (Z0 à Zm-1), correspondant au nombre des communications virtuelles passant par l'intermédiaire de ces lignes,
    au cours de l'établissement de la communication virtuelle considérée, un dispositif central de commande (ST) peut mettre les compteurs dans un état de comptage initial fixé,
    les différents compteurs peuvent être commandés individuellement, lors de l'apparition de cellules d'informations sur la ligne d'arrivée ou de départ associée, en fonction de l'en-tête de cellule contenu dans ces cellules d'informations,
    à chaque commande d'un compteur, son état de comptage momentané, à partir de l'état de comptage initial fixé, peut être modifié d'une unité de comptage,
    et les états de comptage momentanés des compteurs associés à une communication virtuelle peuvent être interrogés par le dispositif central de commande, au moins à la suppression de la communication virtuelle, en vue de la détermination du taux de pertes.
  5. Dispositif selon la revendication 4,
       caractérisé par le fait que
       les états de comptage momentanés des compteurs (Z0 à Zm-1) peuvent être interrogés en plus à des intervalles de temps fixés.
  6. Dispositif selon la revendication 4,
       caractérisé par le fait que
    les compteurs (Z0 à Zm-1) sont conçus comme des compteurs tournant périodiquement
    et, à chaque fois qu'ils atteignent un état de comptage fixé, un signal d'avis est envoyé séparément au dispositif central de commande (ST) avant une suppression de la communication virtuelle considérée.
EP90115250A 1990-08-08 1990-08-08 Méthode et dispositif pour déterminer la qualité de circuits virtuels transitant par un dispositif de commutation ATM Expired - Lifetime EP0470283B1 (fr)

Priority Applications (6)

Application Number Priority Date Filing Date Title
DE59010651T DE59010651D1 (de) 1990-08-08 1990-08-08 Verfahren und Schaltungsanordnung zum Ermitteln der Güte von über eine ATM-Vermittlungseinrichtung verlaufenden virtuellen Verbindungen
AT90115250T ATE149070T1 (de) 1990-08-08 1990-08-08 Verfahren und schaltungsanordnung zum ermitteln der güte von über eine atm- vermittlungseinrichtung verlaufenden virtuellen verbindungen
EP90115250A EP0470283B1 (fr) 1990-08-08 1990-08-08 Méthode et dispositif pour déterminer la qualité de circuits virtuels transitant par un dispositif de commutation ATM
JP22089891A JP3207879B2 (ja) 1990-08-08 1991-08-05 仮想接続の良さを求めるための方法および回路装置
CA002048459A CA2048459C (fr) 1990-08-08 1991-08-06 Methode et circuit pour determiner la qualite des connexions virtuelles via un materiel de commutation mta
US07/741,731 US5142653A (en) 1990-08-08 1991-08-07 Method and circuit arrangement for determining the quality of virtual connections through an asynchronous transfer mode switching equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP90115250A EP0470283B1 (fr) 1990-08-08 1990-08-08 Méthode et dispositif pour déterminer la qualité de circuits virtuels transitant par un dispositif de commutation ATM

Publications (2)

Publication Number Publication Date
EP0470283A1 EP0470283A1 (fr) 1992-02-12
EP0470283B1 true EP0470283B1 (fr) 1997-02-19

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EP90115250A Expired - Lifetime EP0470283B1 (fr) 1990-08-08 1990-08-08 Méthode et dispositif pour déterminer la qualité de circuits virtuels transitant par un dispositif de commutation ATM

Country Status (6)

Country Link
US (1) US5142653A (fr)
EP (1) EP0470283B1 (fr)
JP (1) JP3207879B2 (fr)
AT (1) ATE149070T1 (fr)
CA (1) CA2048459C (fr)
DE (1) DE59010651D1 (fr)

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Also Published As

Publication number Publication date
US5142653A (en) 1992-08-25
DE59010651D1 (de) 1997-03-27
CA2048459C (fr) 2000-04-25
JPH04234246A (ja) 1992-08-21
EP0470283A1 (fr) 1992-02-12
ATE149070T1 (de) 1997-03-15
JP3207879B2 (ja) 2001-09-10
CA2048459A1 (fr) 1992-02-09

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